Chevrolet UPLANDER 2007 Owner's Manual page 222

Defogging and Defrosting
Fog on the inside of windows is a result of high
humidity, or moisture, condensing on the cool
window glass. This can be minimized if the climate
control system is used properly. There are two
modes to clear fog or frost from your windshield.
Use the defog mode to clear the windows of
fog or moisture and warm the passengers. Use
the defrost mode to remove fog or frost from
the windshield more quickly.
Turn the right knob to select the defog or
defrost mode.
-
(Defog): This mode directs air to the
windshield and the floor outlets. When this mode
is selected, the system runs the air conditioning
compressor unless the outside temperature is at or
below freezing.
The recirculation mode cannot be selected while
in the defog mode.
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(Defrost): This mode directs most of the air to
the windshield and the side window outlets, with
some air directed to the floor outlets. In this mode,
the system will automatically run the air
conditioning compressor, unless the outside
temperature is at or below freezing.
Recirculation cannot be selected while in the
defrost mode.
Do not drive the vehicle until all the windows are
clear.